MOSCOW -- He won the bet, but lost his life.
Police say 2 women bet their friend Sergey Tuganov that he couldn't keep up with them during a 12-hour sex marathon.
The prize, $4,300.
Tuganov took the bet and decided to boost his chances of winning by downing a bottle of Viagra.
It worked. He won the wager.
But just minutes later, the 28-year-old mechanic died of a heart attack, Moscow police said.
"We called emergency services but it was too late, there was nothing they could do," said one of the female participants who identified herself only as Alina.